Witch engine should i use to make Southpark: The stick of thruth 2.5d kinda game, i don't really like unity, and can i use adobe flash?

What is "The Stick Of Truth" - game play wise ?

If you look at the game's mechanics closely, it should not be too difficult to match the game play to an engine.

I have to ask this - do you know how to code more than the basic "Hello World" ?

All "game engines" require you to write your own game scripts if you want to actually do anything useful .

Note: Flash is a multi-media platform, not a game engine. It is possible to write games using Action Script - ironically called 'Flash Games' .

Yes, you could create this in flash. Or, you could use unity, or you could use unreal engine 4, or you could use XNA or monogame. Looking at the design of the graphics in the game, any engine will suffice.

You don't even need real programming skills to do this as you could use something like Game Maker or RPG Maker and produce something playable.

Your problem wouldn't be the coding side, but getting someone to draw up all the cartoon graphics. Yes, someone would have to draw them, because im sure you're aware already you can't just use southpark characters and you plan to draw your own (You wouldnt be allowed to use theirs even if you say it's a parody, and yeah, that's ironic considering the content of south park).

Good luck!